Blowpipe with rotatable locking collar for quickly detachable head



. C. ANTHES BLOWPIFE WITH ROTATABLE LOCKING- COLLAR FOR QUICKLY BLEHEAD.

Filed An 1952 DETACHA ril 18,

'INVENTOR CLIFFORD C ANTHES ATTORNEY Patented Mar. 23,4954 ii BLOWPIPEWITH ROTATABLE LOCKING COLLAR FOR QUICKLY DETAGHABLE HEAD Clifford C.Anthes, Union, N. J assignor to Union "Carbide and Carbon Corporation, acorporation of New York Application April is, 1952, Serial No. 283,054

' An object of this invention is to provide a blow pipe with quicklydetachable connection for a push-in and pull-.outtype head in which saidconnection has a locking collar which is simple in construction,inexpensive to manufacture and easy to replace. V

A rotatably adjustable quickly detachable push-in and pull-out type headfor a blowpipe has been provided with a locking collar which isrotatable by an operators thumb a half turn or less to move a lockingdetent to a position for removal of the head. On insertion of the headafter such angular movement of the looking collar to allow fullinsertion of the head, a spring carried by the. collar has biasedthecollar to its locking position. One such looking collar for that typehead is shown in the patent to Jacobsson 2,518,895,dated August 15,1950. A practical difficulty with blowpipes of this type is the factthat the locking collar sometimes has to be removed for cleaning orreplacement after breakage or injury in the rough treatment to which ablowpipe may be subjected. Use of the blowpipe, in sandy country maycause sand to become clogged within the collar grooves, obstructingmovement of the locking balls. Thus, from a variety of causes it hasbeen found necessary'sometimes toremove sucha'locking collar, althoughthat has "not been found necessary in the ordinary use oithe blowpipe. tSpecifically, the object of this invention is accomplished by providinga blowpipe with a'locking collar having a cam actuated locking pin."

grooves in the collar or elsewhere, the surface on which the collarrotates has been formed eccentric to the removable head. A transverseslot has been cut in this surface and the looking pin given a freelysliding fit in this groove for not only its locking and unlockingfunction but also the pin functionsto retain the collar againstlongitudinal movement, and requires no radially inwardly spun flangethat is difficult to remove for removal of the collar. To remove thecollar in this invention, it is only necessary to back off the pin whichis threaded in the Instead of incurring the expense of cutting'cam 6Claims. .(Cl. 15827.4)

2 Fig. 2 is a section on the line 2--2 of Fig. 3

with the head locked, in place by the collar.

Fig. 3 is a section on the line 3-3 of Fig. 1.

' Fig. 4 is a view corresponding to Fig. 3 except that the lockingcollar is there shown rotated to an unlocked position in which theremovable head may be quickly pulled out from the blowpipe.

The body end portion [0 of a blowpipe is provided with an eccentricsocket II for reception of the quickly detachable push-in and pull-outtype welding head [2 provided with a shoulder l3 that abuts the outerend portion of the body l0. Any well known type head may be used butthat illustrated in the present invention is one in which the mixing ofgaseous fuel and oxidizing gas takes place within the head. To retainthe head in its locked position, the pin l4 carried by the collar l5projects radially inwardly far enough to engage a flange portion of thehead. The collar i5 is rotatable through approximately 45" or enough forthe pin to be; withdrawn from engagement with the head in the ,positionshown in Fig. 4 for withdrawal of the head. The collar 15 rotates on theblowpipe body end portion Hl'which has the socket ll eccentric to theouter cylindrical surface of the body portion I0, so that with thecollar and pin in the position shown in Fig. 3 the pin projects inwardlyenough to prevent removal of the head, yet in the position shown in Fig.4 the head may be withdrawn. To bias the collarv l5 to a locked positionthe usual spring l6 engages both the collar and blowpipe body for thatpurpose. When the operator rotates the collar he moves it against theaction of the spring [6.

The collar l5 engages the abutment-wall IT on the blowpipe. Atransverseslot I8 in the body 10 is of 5111110161113 angular extent to enable thelocking pin I4 to be rotatable with the collarfrom its locked tounlocked position of the collar and'pin. The locking pin 14 is providedwith a threaded portion is and a reduced end portion 20, the threadedportion enabling the pinto be in threaded engagement with the collar.

The outer end portion of the blowpipe engaged by the abutment l3 of thehead is designated by the numeral 2 I. The axis of the generallycylindrical end portion In of the blowpipe is designated. by the numeral23, whereas the axis of the socket I l is designated by the numeral 22.The collar I5 rotates about the axis 23 on the outer generallycylindrical surface 24 of the 3 body In. As shown in Figs. 3 and 4, thecollar is provided with a projection 25 on each side of which is a thumbengaging groove 26 and 21, enabling a right-handed .operator to have histhumb in the groove 26 for rotating the collar against the action of thespring IE. to, the unlocked position shown in Fig. 4. A left-handedoperator may find it more convenient to have his thumb in the groove 2?.

As shown in Fig. 2, a flange 28 on the removable head is adapted to beengaged bythe lock ing pin [4 to prevent removal of the head. This headis provided with the usual gas passages and ring packing which are notdescribed because they form no part of the present invention. When thecollar is in its locked position, the pin l4 projects about .025" below.the circumference of the flange 23, and when the collar has been rotatedthe desired amount to the unlocked po: sition of Fig. 4, the pin clearsthe flange 28 to allow the head to. be pulled out.

Among th advantages of this invention may be mentioned the ease andfacility with which the. removable head is quickly insertable and lockedin position in the blowpipe. The. locking pin I4 is, functionallyintegral with the locking collar [5. To assemble the, blowpipe andcollar it is only necessary to put the collar in place, then screw inthe pin until the shoulder illustrated between the threaded portion andthe. re-

duced end portion is seated when the pin projects through the slot l8and functions not only as a locking pin but also to keep the collar 15in position longitudinally against being moved out of place. In theimproved blowpipe, the body it, is of stainless steel and the collar iis of an aluminil 1n alloy. The construction is so assembled that it hasbeen estimated the saving in time in assembly of the collar and itslocking detent on a blowpipe is, approximately 200% greater than is thetime needed to assemble a locking collar hav ing a locking ball and lessclose tolerances are needed in the. present invention than in thatformer type. It has been found that a blowpipe does have to bedisassembled occasionally in desert country, for example, when blowingsand may get under the collar, or in case of dirt from other causes, orin case of fracture. Eor this reason, assembly of the locking collar andits removal are important advantages to the operr ator of a blowpipe. Toremove the collar in the present invention, it is only necessary tounscrew the threaded portion [9 of the pin [4 and back it ofli until thereduced portion 2c clears the slot t The he d o the e, v d i h, a' l as,shown in Figs. 2 to 4, in which a screwdriver is applicable for quickassembly and dis assembly oi the collar and pin.

' What is claimedis:

1. In a blowpipe of the type having a quickly detachable push-in andpull-out type rotatably adjustable head, a rotatable locking collar forholding said head locked to the blowpipe body end portion againstremoval in one position of said collar and with said head removable inanother position of the collar, a spring withinsaid collar cooperatingwith the blowpipe body and with said collar for biasing said collar toits position in which said head is locked against removal, said body endportion cooperating with a shoulder on said head to limit inwardmovement of said head into the body end portion, a flange on a portionof the head inserted in said body end portion, and a locking detentcarried by said collar for cooperation with said flange to retain saidhead in a locked position of said collar to prevent withdrawal of saidhead, the. combination therewith of the. improvement enabling saidcollar to be readily assembled on the blowpipe body end portion andremoved therefrom with ease and facility for replacement or servicing,said improvement including the blowpipe body end portion on which thecollar is rotatable having an outer surface which is eccentric to saidhead and provided withv an arcuate. transverse slot longitudinallyintermediate the end faces of said collar, said locking detentcomprising a pin fixed with respect to said collar and being of a lengthto extend through said slot and engage said flange to prevent withdrawalof said head in a position in which the collar locks said head but shortenough to clear said flange and allow withdrawal ofsaid head when saidcollar has been rotated against the action of its spring to an unlockedposition, said pin having a freely sliding fit within said slot andretaining said collar against longitudinal movement with respect to saidblowpipe body e d portion on which it is mounted.

' 2. A blowpipe according to claim 1 in which said transverse slot isonly long enough to, allow a movement of the pin and collar of about 45.

3. A blowpipe according to claim 2 in which said pin projects about .025of an inch below the circumference of said flange in locking positionand the eccentricity of the, body outerend portion outer surface withrespect to the, axis, of said head is about .10 of an inch.

4. A blowpipe according to claim 1 in which said pin is threaded intosaid collar.

5. A blowpipe according to claim 4 in which the portion of the pinprojecting radially in-v wardly of said collar is of reduced diameterwith respect to the threaded portion of the pin and said collar has athreaded "pin receiving recess with a seat at its base through which;the reduced portion of the pin projects.

6,. A quickly detachable connection comprising male and female members,the female member having a portion of its outer surface eccentric withrespect to the male member to provide a cam surface, a locking collarrelatively rotatable on such outer surface, a pin fixed with respect tothe collar and projecting beneath said cam surface, said female memberhaving a transyerse slot receiving said pin, and a flange on the malemem engaged b sai pin o revent wi h:

a el '01 t eme m m er is. qe ns noti es of the collar but allow the pinto clear said flange in an unlocked position, for said collar.

CLIFFQRD o. fe c Ci e in he le f i aten NiTED ATES. P TE TS Number NameDate 457,781 Josef Aug. 18-, 1891 1,125,067 Cook Jan. 19, 1915 1,568,295Schleicher Jan. v5, 1926 2,518,895 Jacobsson et a1. Aug. 15, 19502,544,712 Miller Mar. 13,1951; 2,587,838 Green Mar. 4, 1 952 2,697,404:iT T. 19.52

